Black areas in a rendering

[belal.a...@gmail.com]

Hello,

I'm using Accelerad through Honeybee but the renderings do look strange with black curved lines (see image below). It seems to be one of the radiance parameters but can't quite figure out what's causing this issue. Any pointers would be appreciated!

Best,

Belal

[Nathaniel Jones]

Hi Belal,

The black areas are the result of inadequate irradiance cache coverage. For some reason, only the bottom half of your image has been populated by the irradiance cache. Can you share your model so that I can take a look at why this is happening?

You can usually solve irradiance cache coverage issues by increasing the cache size with the -ac parameter (default is 4096), or by increasing the radius of each patch (by decreasing -ar or increasing -aa). Some other possibilities include changing the spacing with -al, increasing the position weighting with -ax, or changing the number of k-means iterations with -an. You can set -ag to about a quarter of -ad to fill in the regions that were missed, though this is a slower calculation. See the documentation for explanations of each parameter.

Nathaniel

[belal.a...@gmail.com]

Hi Nathaniel,

Thanks for your response. I actually tried increasing -ac to 6000 and decreasing it to -ac1000 and it seemed to solve the problem in both cases. Not sure if this has to be with Honeybee assuming an inappropriate -ac.

Best,

Belal